We almost do not use two-bladed propellers. Trilobe more comfortable, have a low level of noise and vibration, greater traction.Recently, Hungarian pilots got traction in Rotax-503 159 kg instead of 125 (saber propeller diameter of 63 "). Who will refuse from this?American pilot reported recently that the increase traction on his trike was 25 kg compared with straight blades. Who will refuse from this?